Mask



FIG. 1 is a perspective view of a mask showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right side view thereof, the left side view being a mirror image;

FIG. 5 is a top plan view thereof, the bottom plan view being a mirror image;

FIG. 6 is another perspective view being used, shown in an alternate position;

FIG. 7 is an enlarged cross-sectional view taken along section line 7-7 of FIG. 2;

FIG. 8 is an enlarged view of the portion encircled in FIG. 4; and,

FIG. 9 is an enlarged view of the portion encircled in FIG. 5.

The broken lines in the drawings depict portions of the mask that form no part of claimed design. 

CLAIM The ornamental design for a mask, as shown and described. 